I love Sufjan Stevens, but I don’t see the comparison. While I really love his lyrics (one of the few I actually like them, I usually find most artist lyrics to be plain and way too cheesy), his music is very simple compared to a behemoth like Mozart.
Mozart was able to write highly complex music very fast, that went from deep themes to silly ones, and enjoyed popularity from both critics and public, which is something quite rare.
I don’t which one would be the closest today. Maybe something like Williams or Ennio Morricone.
That’s sick! There are many fantasy ranges in 3d that imho are even better than GWs, and they are gonna explore im popularity with old world. Last Sword are my favorite, so much character.